Demopolis Airport Ind Park WWTP - Secondary Treatment in Marengo County, Alabama

Demopolis Airport Ind Park WWTP is a municipal wastewater treatment facility located in Marengo County, Alabama, United States. The plant serves a small population of approximately 200 people, reflecting its role in a rural or industrial park setting. As a secondary treatment plant, it provides biological treatment to reduce organic matter and suspended solids before discharge. The plant operates under the US Clean Water Act, which requires NPDES permits for all point source discharges. For small facilities like this, secondary treatment is the standard requirement, ensuring compliance with federal effluent guidelines. The designed capacity of 7.57 million gallons per day (MGD) suggests the plant may handle industrial flows from the airport industrial park in addition to domestic wastewater. The treated effluent is discharged into local surface waters, likely tributaries of the Tombigbee River, which flows south to Mobile Bay and the Gulf of Mexico. The plant's inland location and small population served reduce its environmental footprint, but proper operation remains important for protecting downstream aquatic ecosystems in the Mobile River Basin.

The plant discharges into local streams that drain into the Tombigbee River, a major tributary of the Mobile River system. This river network ultimately flows into Mobile Bay and the Gulf of Mexico, supporting diverse aquatic life including fish, crustaceans, and migratory birds. The watershed is ecologically sensitive due to its role in nutrient cycling and habitat provision for species such as the Alabama sturgeon and Gulf sturgeon.